The next step consisted of selecting student classes.
The managers of each HEI that agreed to participate in this
study was asked to provide a list of mandatory subjects for
all classroom-based, undergraduate-level courses on their
HEI state capital campus. This subject list was segregated by
academic year, study period and course to enable researchers
to randomly select the classes from which to invite students
to participate. Therefore, each HEI had its own sampling
frame in the second selection stage.